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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Grants Valuation Assumptions

The following table presents the assumptions used in the Monte Carlo simulation model to determine the fair value of these stock-based awards on their issuance date:

Risk-free interest rate			1.5	%
Expected volatility			49.0	%
Expected dividend yield			0	%
Derived service period (in years)			4.1

Schedule of Stock Options Activity

The following table summarizes the Company’s option activity since December 31, 2019:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term				Aggregate Intrinsic Value
										(in years)				(in thousands)
Outstanding as of December 31, 2019			2,827,868			$	7.17				6.5			$	76,850
Granted			531,108				45.17
Exercised			(776,914	)			6.32
Forfeited			(393,143	)			33.26
Outstanding as of December 31, 2020			2,188,919			$	12.01				5.72			$	57,538
Vested and expected to vest as of December 31, 2020			2,121,884			$	12.12				5.71			$	55,616
Options exercisable as of December 31, 2020			1,370,762			$	6.94				4.84			$	41,689

Schedule of Unvested Restricted Stock Units

The following table summarizes the Company’s RSU activity since December 31, 2019:

		Number of Shares				Weighted Average Grant- Date Fair Value
Unvested balance December 31, 2019			3,367,846			$	14.84
Granted			1,331,417				42.35
Vested			(998,478	)			16.30
Forfeited			(558,565	)			19.02
Unvested balance December 31, 2020			3,142,220			$	25.29

Summary of Stock-Based Compensation Expense of Statements of Operations and Comprehensive Loss

The Company recorded stock-based compensation expense in the following expense categories of its statements of operations and comprehensive loss (in thousands):

		Year Ended December 31,
		2020				2019
Cost of revenue		$	361			$	193
Sales and marketing			10,246				3,805
Research and development			7,751				3,967
General and administrative			5,821				4,756
		$	24,179			$	12,721

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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